FI93901B - Measuring device for cross-sectional measurement of a paper web and its use - Google Patents

Measuring device for cross-sectional measurement of a paper web and its use Download PDF

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Publication number
FI93901B
FI93901B FI910598A FI910598A FI93901B FI 93901 B FI93901 B FI 93901B FI 910598 A FI910598 A FI 910598A FI 910598 A FI910598 A FI 910598A FI 93901 B FI93901 B FI 93901B
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Finland
Prior art keywords
measuring
paper web
cross
measuring device
measurement
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FI910598A
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Finnish (fi)
Swedish (sv)
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FI910598A0 (en
FI93901C (en
Inventor
Rudolf Muench
Elmer Weisshuhn
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Escher Wyss Gmbh
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Publication of FI910598A0 publication Critical patent/FI910598A0/en
Publication of FI93901B publication Critical patent/FI93901B/en
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Publication of FI93901C publication Critical patent/FI93901C/en

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G9/00—Other accessories for paper-making machines
    • D21G9/0009—Paper-making control systems
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D21F7/06—Indicating or regulating the thickness of the layer; Signal devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
    • G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
    • G01B21/08—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness for measuring thickness
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/34—Paper
    • G01N33/346—Paper sheets

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Medicinal Chemistry (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Paper (AREA)

Description

9390193901

Mittauslaite paperiradan poikkiprofiilin mittaamiseksi ja sen käyttöMeasuring device for measuring the cross-sectional profile of a paper web and its use

Keksintö koskee patenttivaatimuksen 1 lajimääritel-5 män mukaista mittauslaitetta.The invention relates to a measuring device according to the species definition of claim 1.

Nykyiselle menetelmälle on ominaista, että mittaus-päätä liikutetaan tasaisella poikittaisnopeudella mittaus-siltaa pitkin paperirataan nähden poikittaisessa suunnassa. Tästä johtuen mittaukset yksittäisillä mittausalueilla 10 tapahtuvat aina samalla aikarasterilla.The present method is characterized in that the measuring head is moved at a constant transverse speed along the measuring bridge in a direction transverse to the paper web. Due to this, the measurements in the individual measuring areas 10 always take place in the same time raster.

Mittauksen tarkoituksena on saada aikaan stabiili poikkiprofiili ja sen mukaan korjaukset perälaatikossa, esimerkiksi säätämällä perälaatikon aukon sisäläpimittoja pituus- ja poikkisuunnassa ajosuuntaan nähden halutun 15 poikkiprofiilin aikaansaamiseksi. Halutun radan poikkiprofiilin muotoutumista haittaavat perälaatikosta tulevassa massasuihkussa esiintyvät häiriöt. Näitä häiriöitä, jotka saavat aikaan poikkeamia halutusta poikkiprofiilista, ei voida aina käsitellä kovin tarkasti. On esimerkiksi mah-20 dollista, että häiriötaajuus ja mittaustaajuus ovat koko-naislukusuhteessä toisiinsa nähden. Silloin mittaustulos voi antaa harhaan johtavan käsityksen, että kyseessä on poikkeama halutusta poikkiprofiilista. Korjaustoimenpiteet tällaisen mittauksen jälkeen eivät siten johda halutun 25 radan poikkiprofiilin saavuttamiseen.The purpose of the measurement is to provide a stable cross-section and, accordingly, corrections in the headbox, for example by adjusting the inside diameters of the headbox opening in the longitudinal and transverse directions with respect to the direction of travel to obtain the desired cross-section. The formation of the cross-sectional profile of the desired track is hindered by disturbances in the mass jet coming from the headbox. These disturbances, which cause deviations from the desired cross-section, cannot always be handled very accurately. For example, it is possible for the interference frequency and the measurement frequency to be in an integer ratio with respect to each other. Then the measurement result may give the misleading impression that it is a deviation from the desired cross-section. Corrective action after such a measurement thus does not result in achieving the desired 25 track cross section profile.

GB-A-1 228 001 esittää mittauslaitteen ohikulkevan radan keskiaivojen, esimerkiksi paksuuden osalta, mittaamiseksi. Tällöin pyyhkäisynopeus säädetään suhteessa radan ajonopeuteen. Tämä mittausmenetelmä ei kuitenkaan estä 30 mittaustaajuuden ja häiriötaajuuden yhdenmukaisuudesta johtuvaa tulosten vääristymistä.GB-A-1 228 001 discloses a measuring device for measuring the midbrain, for example thickness, of a passing track. In this case, the sweep speed is adjusted in relation to the running speed of the track. However, this measurement method does not prevent distortion of the results due to the uniformity of the measurement frequency and the interference frequency.

* 1 Keksinnön tarkoituksena on ehdottaa laite tai me netelmä paperiradan poikkiprofiilin mittaamiseksi, jonka avulla voidaan saada aikaan stabiili poikkiprofiili pape-35 riradan tarkasteltavalta pituudelta. Tämän tulisi estää V . s ♦ 2 93901 poikkiprofiilin virhearvioinnit sekä tästä johtuvat tarpeettomat säätötoimenpiteet paperiradan poikkiprofiilia säätelevissä laitteissa.* 1 The object of the invention is to propose an apparatus or method for measuring the cross-sectional profile of a paper web, by means of which a stable cross-sectional profile can be obtained for the considered length of the paper-web. This should prevent V. s ♦ 2 93901 cross-section error estimates and consequent unnecessary adjustments in paper path cross-section control devices.

Tämä voidaan saavuttaa lajille tunnusomaisella 5 laitteella patenttivaatimuksen 1 tunnusmerkeissä määritel tyjen toimenpiteiden avulla.This can be achieved with a species-specific device 5 by means of the measures defined in the features of claim 1.

Patenttivaatimuksessa 2 esitetään keksinnön kohteen edullinen sovellus ja patenttivaatimuksessa 3 sopiva käyttömahdollisuus .Claim 2 shows a preferred embodiment of the subject matter of the invention and claim 3 a suitable use.

10 Seuraavassa keksinnön kohdetta kuvataan ja selite tään tarkemmin. Kuvaus perustuu piirrokseen, jossa:10 In the following, the object of the invention will be described and explained in more detail. The description is based on a drawing in which:

Kuviossa 1 on esitettynä kaavakuva keksinnön kohteesta ylhäältä päin katsottuna.Figure 1 is a schematic top view of an object of the invention.

Kuviossa 2 on esitettynä mittaustoimenpide, jossa 15 käytetään keksinnön mukaista laitetta.Figure 2 shows a measuring procedure in which a device according to the invention is used.

Materiaaliradan, tässä paperiradan 2, poikkiprofiilin mittaamiseksi tarkoitetussa mittauslaitteessa 1, joka sijoitetaan perälaatikon 3 jälkeen ja joka liikkuu nuolen osoittamaan suuntaan tietyllä nopeudella, on mittaussilta 20 4, joka sijoitetaan kiinteästi radan 2 yläpuolelle poikit tain rataan nähden. Mittaussillalla 4 on mittauspää 5, jota voidaan liikuttaa edes takaisin mittaussiltaa 4 pitkin, toisin sanoen poikittain mittaussillan alapuolella kulkevaan rataan 2 nähden.The material web, this measurement device for measuring the paper web 2, the cross section 1, which is placed after the head box 3 and travels in the arrow direction at a certain speed, a measuring bridge in April 20, which is positioned closely above the track 2 transversely to the path of Tain. The measuring bridge 4 has a measuring head 5 which can even be moved back along the measuring bridge 4, i.e. transversely to the track 2 running below the measuring bridge.

„ . r 25 Tämä liike saadaan aikaan vaihtosuuntaisella käyt- tömoottorilla 6, jonka käyntinopeuttta voidaan säätää. Moottoria 6 säädellään prosessiohjausjärjestelmän 7 avulla, johon syötetään myös mittauskohdissa 12 mitatut mittausarvot poikiprofiilin määrittämiseksi.„. r 25 This movement is effected by a reciprocating drive motor 6, the speed of which can be adjusted. The motor 6 is controlled by means of a process control system 7, to which the measured values measured at the measuring points 12 are also entered in order to determine the cross-section.

30 Yksittäiset mittaukset suoritetaan kulloinkin pape riradassa 2 olevien kuviteltujen viivojen 13 mukaisesti, jotka kulkevat yksittäisten mittauskohtien 12 alla paperi-rataa pitkin.The individual measurements are in each case performed according to the imaginary lines 13 in the paper path 2, which run under the individual measurement points 12 along the paper path.

Prosessiohjausjärjestelmässä on poikittaiskulkuoh-35 jelma 11, jonka mukaan käyttömoottoria 6 ohjataan. Tämä 1The process control system has a transverse control program 11, according to which the drive motor 6 is controlled. This 1

IIII

· \ 3 93901 tapahtuu siten, että mittauspään 5 poikittaisnopeutta muutetaan jokaisen paperiradan 2 ylityksen jälkeen, tai siten, että odotusajan kestoa, eli aikaa, joka kuluu kulloinkin kahden poikkikulun välillä, muutetaan. On myös 5 mahdollista jatkuvasti muuttaa sekä poikittaisnopeutta sekä odotusajan kestoa. Mittaustoimenpiteen tarkoituksena on suorittaa mittaus kutakin yksittäistä viivaa 13 pitkin toisiinsa nähden eri pituisin epäsäännöllisin väliajoin.· \ 3 93901 takes place in such a way that the transverse speed of the measuring head 5 is changed after each paper path 2 is crossed, or in such a way that the duration of the waiting time, i.e. the time which elapses between the two transverse passes in each case, is changed. It is also possible to continuously change both the transverse speed and the duration of the waiting time. The purpose of the measurement procedure is to perform a measurement along each individual line 13 at irregular intervals of different lengths relative to each other.

Esimerkki tällaisesta menetelmästä on kaavamaisesti 10 esitettynä kuviossa 2:An example of such a method is schematically shown in Figure 2:

Mittauksen kulku on esitettynä paperiradan pitkittäisleikkauksena BL leveydeltä B. Paperirata kulkee nuolen osoittamaan suuntaan. Yhtenäinen viiva radan yläpuolella esittää eri poikittaisnopeuksilla tapahtuvaa mittauspään 5 15 liikettä suhteessa paperirataan. Mittauspään 5 poikittais- kulkuun kuluva aika on merkitty kahteen ensimmäiseen läpi-kulkuvaiheeseen kirjaimilla TT. Yksittäiset mittauspisteet on merkitty yhteen viivoista 13 merkinnällä M-M7, ja ne on esitetty pikkuviivalla pituussunnassa. Yksittäisten poi-20 kittaislinjojen välinen etäisyys on ilmoitettu kunkin odotusajan kestolla TW1-TW7, mikä merkitsee aikaa, joka kuluu kahden toisiaan seuraavan poikkikulun välillä, tai mikä oli ennalta suunniteltu. Kahden peräkkäisen mittauksen M-M7 väliset etäisyydet on havainnollisettu merkinnällä Tl- ,v·. 25 T7, ja ne eroavat toisistaan, siten että myös ne mittauk-< · set, joissa mittaustaajuus muuttuu, otetaan mukaan. Koska tämä taajuus valittiin mielivaltaisesti ja sitä muuteltiin, on periaatteessa epätodennäköistä, että tämä taajuus ja häiriötaajuus olisivat rainanmuodostuksessa yhtenevä!-30 siä, mikä johtaisi mittaustuloksen vääristymiseen ja siten sen virhetulkintaan. Mahdollisuus stabiilin poikkiprofii-livaihtelun virhetulkintaan eliminoidaan täten mittauksen epäsäännönmukaisuudella.The measurement of travel of the paper web is shown in a longitudinal section of the BL width B. The paper web runs in the direction of the arrow. The solid line above the path shows the movement of the measuring head 5 at different transverse speeds relative to the paper path. The time taken for the transverse passage of the measuring head 5 is denoted by the letters TT for the first two pass-through steps. The individual measuring points are marked on one of the lines 13 by the notation M-M7 and are shown by a small line in the longitudinal direction. The distance between individual poit-20 putty lines is reported for the duration of each waiting time TW1-TW7, which means the time that elapses between two consecutive crossings, or that was pre-planned. The distances between two successive measurements M-M7 are illustrated by the notation Tl-, v ·. 25 T7, and they differ from each other in that the measurements in which the measurement frequency changes are also included. Since this frequency was chosen arbitrarily and changed, it is in principle unlikely that this frequency and the interference frequency would be the same in web formation, which would lead to distortion of the measurement result and thus to its misinterpretation. The possibility of misinterpretation of stable cross-profile variation is thus eliminated by measurement irregularity.

Perälaatikon 3 aukkoa voidaan mittaustulosten ti-35 lastollisen arvioinnin jälkeen säätää menestyksellisesti • ·♦ 4 93901 ohjauslaskimen 8 avulla. Sen ohjauskäskyt ohjataan johtojen 9 avulla säätöelimeen 10, joka on tarkoitettu perälaa-tikon aukon sisäläpimittojen säätämiseen poikkisuunnassa paperirataan nähden. On myös mahdollista, että ohjauslas-5 kimen 8 ohjauskäskyt ohjattaisiin joillekin toisille säätölaitteille paperiradan poikkiprofiilin säätämiseksi. Näitä säätölaitteita voitaisiin ohjata sekä ennen paperikoneen rainanmuodostusaluetta että sen jälkeen.After opening the measurement results ti-35, the opening of the headbox 3 can be successfully adjusted • · ♦ 4 93901 with the help of the control calculator 8. Its control commands are guided by means of wires 9 to an adjusting member 10 for adjusting the inner diameters of the headbox opening transversely to the paper web. It is also possible that the control instructions of the guide glass 5 output 8 are directed to some other control devices to adjust the cross-section of the paper web. These adjusting devices could be controlled both before and after the web forming area of the paper machine.

• ( • <• (• <

IlIl

Claims (3)

1. Mätanordning (1) för mätning av tvärsnitts-profilen i en efter inloppslädan (3) bildad pappersbana 5 (2), vid vilken en ovanom pappersbanan i dess tvärriktning finns en fast mätanordning (4) med ett i förhällande tili pappersbanan traverserande rörligt mäthuvud (5), varmed mätvärden (M) för uppskattning av pappersbanans tjocklek fäs frän det mätställe ovanom vilket mäthuvudet (5) just 10 befinner sig under traverseringsrörelsen pä mätbryggan längs den under denna löpande pappersbanan (2), varvid mätvärdena fäs frän ifrägavarande längs mätbryggan anord-nade mätställen (12), kännetecknad därav, att mätanordningen (1) har ett processtyrsystem (7), som 15 medelst ett traverseringsprogram (11) förändrar tiden (TT) för mäthuvudets (5) traversering och/eller väntetiden (TW) mellan tvä traverseringar efter varje passering av mät-bryggan (4) sälunda, att mätvärdena (M) fäs frän ifrägava-rande enskilda längs pappersbanan belägna mätställen (12) 20 med ständigt förändrade tidsintervall (T), varvid genom den varierande mätfrekvensen förvrängning och misstolkning av mätresultaten tili följd av mätfrekvensens överens-stämmelse med frekvensen för en störning i banbildningen kan undvikas i hög utsträckning. ; . 25A measuring device (1) for measuring the cross-sectional profile in a paper web 5 (2) formed after the inlet drawer (3), in which a fixed measuring device (4) having a movable measuring head traversing in relation to the paper web in its transverse direction is provided (5), whereby measurement values (M) for estimating the thickness of the paper web are obtained from the measuring point above which the measuring head (5) is located just during the traversing movement of the measuring bridge along the running web path (2) below this, the measuring values being applied from the measuring wall -set measuring points (12), characterized in that the measuring device (1) has a process control system (7) which, by means of a traversal program (11), changes the time (TT) of the traverse of the measuring head (5) and / or the waiting time (TW) between two traversing after each passage of the measuring bridge (4), so that the measuring values (M) are obtained from the relevant individual measuring points located along the paper web. (12) with ever-changing time intervals (T), whereby the varying measurement frequency distortion and misinterpretation of the measurement results due to the conformity of the measurement frequency with the frequency of a disturbance in the web formation can be avoided to a great extent. ; . 25 2. Mätanordning enligt patentkravet 1, k ä n n e - i t e c k n a d därav, att den har en styrräknare (8) för beräkning av den stabila tvärprofilen över pappersbanans (2) betraktade längd (BL) ur mätvärdena (M) och för regiering av inställningsanordningarna (10), som päverkar 30 pappersbanans tvärsnittsprofil.2. Measuring device according to claim 1, characterized in that it has a control counter (8) for calculating the stable cross-sectional profile over the length of the paper web (2) considered from the measuring values (M) and for controlling the adjusting devices (10). ), affecting the cross-sectional profile of the paper web. 3. Användning av mätanordningen enligt patentkravet 2, känneteckn ad därav, att inställningsanordningarna (10) regleras för inställning av innermatten i inloppslädans (3) öppningsspalt. ' · ; IIUse of the measuring device according to claim 2, characterized in that the adjusting devices (10) are regulated for adjusting the inner mat in the opening slot of the inlet carriage (3). '·; II
FI910598A 1988-08-10 1991-02-07 Measuring device for cross-sectional measurement of a paper web and its use FI93901C (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3827084 1988-08-10
DE3827084A DE3827084C1 (en) 1988-08-10 1988-08-10
PCT/DE1989/000499 WO1990001673A1 (en) 1988-08-10 1989-08-01 Device for measuring the cross-sectional profile of a paper web
DE8900499 1989-08-01

Publications (3)

Publication Number Publication Date
FI910598A0 FI910598A0 (en) 1991-02-07
FI93901B true FI93901B (en) 1995-02-28
FI93901C FI93901C (en) 1995-06-12

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Application Number Title Priority Date Filing Date
FI910598A FI93901C (en) 1988-08-10 1991-02-07 Measuring device for cross-sectional measurement of a paper web and its use

Country Status (7)

Country Link
US (1) US5298122A (en)
EP (1) EP0430975B1 (en)
JP (1) JPH04501005A (en)
CA (1) CA1322652C (en)
DE (1) DE3827084C1 (en)
FI (1) FI93901C (en)
WO (1) WO1990001673A1 (en)

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Also Published As

Publication number Publication date
DE3827084C1 (en) 1989-11-16
WO1990001673A1 (en) 1990-02-22
US5298122A (en) 1994-03-29
EP0430975A1 (en) 1991-06-12
FI910598A0 (en) 1991-02-07
EP0430975B1 (en) 1992-12-23
JPH04501005A (en) 1992-02-20
FI93901C (en) 1995-06-12
CA1322652C (en) 1993-10-05

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